Man cannot survive on blue jeans alone. And on days when you feel like something different or a little less casual, a pair of black denim dungarees offers up a relaxed refinement which makes for a cool alternative to flannel trousers. Look for simple, straight-leg styles with a dark wash and little to no embellishments. Of course, they can at times look a bit extreme, so make sure to pair yours with light-colored neutrals on top.

When the weather gets too brisk for lightweight chinos and you need to give your raw denim a rest, it's time to break out some corduroys. Not like the baggy, wide-wale ones of yesteryear, today's best cords utilize a thin-wale fabric and a trimmer, more tapered fit. And unlike the muddy colored versions you might remember, they come in all different shades to add some casual color to your wardrobe.

Save 25% at J.Crew on select shirts and pants, including cords, with the code FALLSTYLE (through 09/15).

Sweats

Sweatpants have seen a resurgence in menswear lately, but that doesn't mean the style is getting any sloppier. On the contrary, today's sweats are cut slim with a slightly tapered leg, and a shorter hem so they sit right above your shoe. The construction and materials have gotten a lot beefier too. Heavyweight fleeces and superior stitching make these ten times more durable than any pair your dad used to wear.

Styling Tip: Wear these with a pair of old school sneakers, or balance it out with a more formal topcoat and casual denim or flannel shirt.

Flannel Trousers

A pair of flannel trousers are a true seasonal staple. Ruggedly handsome and built to withstand a serious chill, the pants can't really be brought out until the weather dips. Of course, once it does, you'll want these slim trousers that can easily be worn with a slew of your sweaters or sport coats and look just as good with lace-up shoes as they do with your hiking boots.

Your khakis don't have to be, well, khaki. And if current offerings from some of our favorite brands are any indication, your go-to pair of chinos this fall are going to be rich, garment-dyed shades—from earthy greens and greys to dark navy blues. Whether they're rugged military-spec interpretations or slightly more modern takes, the pants are perfect for transitional weather and make an ideal pinch hitter for your favorite pair of jeans.